German site PCGames.de put together screens of the evolution throughout the 3 main Sims games.  While graphical wise the leap from TS1 to TS2 is a huge step forward, TS2 to TS3 may not look as if it took that big of a step.  However, to me I think the graphics improved quite well, along with the new seamless town and trait system makes it worth purchasing a new game!

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Found by SimTimes and Sims 3 Nieuws